How do I get a value from query and add the value by 1 on Rails

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Ruby

web

Rails

Hi, I really appreciate any respond for this simple question.

test = Model.find_by_sql("SELECT number FROM tbl_one LIMIT 1").each do |a|
    p = a('number')
    puts p
end

Look, I mean, after store a value to 'p', how do I add the 'p' value by 1.

puts p + 1

I tried it but doesn't work. Based on what I saw, the 'p' doesn't really store the value, but I don't really sure. Anyway, I'm new on Ruby and Rails

Any solution?
Thanks.